2015/03/13 by Matthias Sentis, Sentis, Matthias
Chemistry · Engineering · Environmental Science · Physics and Astronomy · #FOS: Physical sciences #Optics (physics.optics) #Spectroscopy and Chemometric Analyses #Surface Roughness and Optical Measurements #Water Quality Monitoring and Analysis #physics.optics
paper · pdf · doi:10.48550/arxiv.1503.04082
PhD Thesis, in French, Marseille, Dec 2014
arxiv created 2015/03/13 · openalex publication_date 2015/03/13 · arxiv updated 2015/03/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
As part of a consortium between academic and industry, this PhD work investigates the interest and capabilities of organic photo-sensors (OPS) for the optical characterization of suspensions and two-phase flows. The principle of new optical particle sizing instruments is proposed to characterize particle systems confined in a cylinder glass (standard configuration for Process Analytical Technologies). To evaluate and optimize the performance of these systems, a Monte-Carlo model has been specifically developed. This model accounts for the numerous parameters of the system: laser beam profile, mirrors, lenses, sample cell, particle medium properties (concentration, mean & standard deviation, refractive indices), OPS shape and positions, etc. Light scattering by particles is treated either by using Lorenz-Mie theory, Debye, or a hybrid model (that takes into account the geometrical and physical contributions). For diluted media (single scattering), particle size analysis is based on the inversion of scattering diagrams obtained over a wide angular range or near optical singularities (rainbow, critical scattering, diffraction). For dense media (multiple scattering), the solutions foreseen are based on the analysis of the backscattering spotlight characteristics.